I hope both you and your girlfriend are over the age of 18 . . . and have a plan for not getting pregnant.

I would agree with you that her continued involvement with this father is not a healthy thing. Living with her step mom is probably not too healthy, but maybe she has no where else to go. That's very unfortunate. I would have thought and hoped that her past victimization would entitle her to assistance to not have to live in her father's household.

She's lucky to be cared for by a guy who puts her welfare ahead of other things. Sex may be something she needs to experience in a secure environment. That's hard to have while she's living where she's living. For now, just take everything real slow.